Add missing include

#215

tests/src/mocks/sdl_mock.hpp

@@ -31,6 +31,8 @@ SUPPRESS_WARNINGS_END
 
 #include "trompeloeil.hpp"
 
+#include "mocks/sdl_mock_export.hpp"
+
 class SDL_MOCK_EXPORT SdlMockInternal {
  public:
   MAKE_MOCK1(SDL_Init, int(Uint32 flags));  // NOLINT(readability/casting)